Zanthier made the remarks Sunday in an interview with the Islamic Republic News Agency (IRNA) on the sidelines of Iran-Europe trade conference held in Tehran.

Three German banks are now working with Iran, he said.

Due to various capacities of Iran, Germany calls for developing ties and investment with Iran, he added.

Commenting on proficiency of Iran deal after US withdrawal, he said its proficiency depends on two factors first whether US walks away from the deal and second how walking away happens.

In response to a question whether contracts between Iran and European countries will be in place after US withdrawal, Zanthier said it depends on the articles of the agreements but if they cannot continue cooperation they have to leave Iran.

KPMG is a professional service company and one of the Big Four auditors, along with Deloitte, Ernst & Young, and PricewaterhouseCoopers.